1. Stockholm conference (Declaration of UN Conference on Human Environment, 1972) led to a 109 point Environmental Action Plan and establishment of the UN Environmental programme (UNEP).

2. Convention on International Trade in Endangered Species of Wild Flora and Faura (CITES) (1973) – grouped almost 30,000 plant and animal species into three levels of protection depending on the degree of regulation required.

3. Montreal Protocol (1987) – For protection of the ozone layer. It phases out production and use of ozone depleting chemicals.

4. Convention on Biological Diversity (CBD) (1992) – The aim was to promote conservation and sustainable use of biodiversity.

5. Kyoto Protocol (1997) – It supplements the 1992 UN Framework Convention on Climate change (UNFCCC) to limit six greenhouse gas emissions. It involved 37 countries and the UN.

6. Paris Agreement (2016) – It is an agreement within the UNFCCC, dealing with greenhouse gas emissions and strengthening global response to the threat of climate change.